Large, prospective non-interventional cohort studies with active surveillance of study participants indicate that many users of oral contraceptives use these preparations not only for contraception but also for the treatment of hormone-dependent diseases and symptoms - such as premenstrual dysphoric disorder, acne, endometriosis, ovarian cysts, polycystic ovary syndrome, bleeding disorders and painful periods. In the International Active Surveillance Study of Women Taking Oral Contraceptives (INAS) more than 30% of participants reported that they use their OC for contra¬ception as well as for the treatment of one of the mentioned conditions.